2. Calculate the number of calories of heat needed to change 500 grams of water by 50 degrees Celsius.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

scientific laws are the result of testing theories and proving them to be facts.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.